Just minutes after he got onto the field, Liam Ridgewell battled for the ball and caught Walcott with a sliding tackle. 29-minutes after that Walcott was withdrawn from the field.It was a nightmare for us as he had his first start of the season limped off the pitch with a medial knee ligament.Arsenal manager Arsene Wenger confirms Theo will be out 3 to 4 weeks:The news is not good. We are without Theo Walcott for longer than expected.We thought it would be just 48 hours but it is a medial knee ligament, which is what I feared after the game. He will be out for three to four weeks.